I use this bullet in my Schoyen Ballard, and it's smaller brother the .32-40 version in another Schoyen Ballard also. Both are favorites of mine and shoot extremely well. 
They don't show up often, but I'd jump on one if you find one that's not collector priced!

Well that’s what I’m trying to figure out. 14” twist kreiger bbl.  But trying to figure out if it needs more throat to accommodate the bullet lands.

Well, the intention is breech seating, but I’m
Still
A Little confused about the concept. 
.376 should get me my .001 interference fit. Rifle will be a stevens 44 1/2 design. Where I feel
Stupid is, how do I know, then I use the dummy cartridge to cam the projectile into position, that the loaded cartridge lines up properly or seats in behind it in the right distance. Does the projectile end up back in the open mouth of the brass? I’ve shot a gun there I used a dummy round to breech seat a projectile, and then put the loaded cartridge in, and I know since it was on smokeless, there was open area in the round itself. But I was going to duplex on BP, and chances are I can set up a load where the projectile sticks out the proper distance to engage the rifling, while being held in by the compressed powder charge and wad stack under it. Am I missing anything ? Thanks.

Ok, but what about the space between your powder charge , wad holding it in, and the back of the bullet that is now well ahead of it ?

Basically, the Hudson designs are nothing but a bore riding bullet, like the 311299 and 311332. The only difference, discounting the GC, is that on the Hudson, the bore riding nose has lube grooves and of course the nose profile but, they work by the same means. The bore ride portion aligns the bullet with the bore and the base bands seal it in the groove from the gas, as well as align the base.

In the case of the Hudson, the throats were suppose to be opened, in the same way as a freebore would do in more modern chambers but, the Hudson can be used accurately when breech seated w/o that relieved area or freebore area if, the base band is not to large.

In any case, the bore riding portion, needs to be .000 to .002 larger than the bore of the barrel and the base needs to be .001 or more larger than the relieved/freebore or the position that the base of the bullet occupies.

I've had great success with BSed, PB, bore riding bullets, such as the NEI 308191, in my 32/35. I've also has good results from shooting the Hudson bullet, fixed, in my original 32/40, 44 Stevens.

UpNorthCountry
A properly seated bullet is not "well ahead" of the case mouth. About 1/16" ahead of the case mouth is an appropriate starting seating depth.
Whether you are shooting with straight smokeless, duplex or straight black powder matters not. This is nothing new. Shooters commonly seated bullets like that back in the 1890s.

I found one of these molds in my mess, (375272) and I have a HW I just finished, (mostly) that now wears a BRC 1:12 twist barrel.  I'm going to use it next week and for a match the first of July, we'll see how it does.  Breech seated.   Best powder recommended? 4759? 
GT